i would think that the 'KMH' is your engine code ... but that's not a valid stamping. could be a mis-stamp from the factory.
the 'K' would code for 1964,
a 'KH' would be a 1v carb, 9.0:1, 155hp 225ci.
'KM' codes for the low comp ( 7.6:1 ) export version of the 300ci v8, thus is clearly wrong.
'M' as the year code would be 1966,
'MH' would be a 2v carb, 9.0:1, 160hp 225ci.
'MK' would be the export low comp 225, practically impossible that you've got that.
i think the '200' is a manufacturing date code, perhaps the 200th day of the year.
198ci was only available two years, 1962-63. 63 was the first year of 'Chevy style' coding and uses 'J' as the first character and year designator. 1962 used the old Buick style codes and would have been stamped "6I", both engines would be 8.8:1 and 135hp. in 62, the 'I' codes the year but is placed at the end of the engine code instead of at the front.
if you decide to go nuts and measure the silly thing, the 198ci is 3.625" x 3.20" bore / stroke while the 225ci is 3.75" x 3.40".
so you MIGHT be able to verify this by pulling a spark plug and inserting a dowel rod to follow the piston from BDC to TDC while you turn the crank pulley. that .2" in stroke length should be noticeable, if you can keep the rod straight and touching the same part of the piston top. obviously, that would be much easier as a two person job.
thanks for pulling those casting codes for us.
i would note though, that the driver and passenger side exhausts will have different casting codes ... and you didn't tell us which one you pulled that exh code from.
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Vladimir Lenin
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H.H. Goddard, Human Efficiency (1920)
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